With backlight controller set to -1 in intel_panel_init_alloc() to distinguish uninitialized values, and controller later being set only if it's present in VBT, we can end up with -1 for the controller:
[drm:intel_bios_init_panel [i915]] VBT backlight PWM modulation frequency 200 Hz, active high, min brightness 0, level 255, controller 4294967295 There's no harm if it happens on platforms that ignore controller due to only one backlight controller being present, like on VLV above, but play it safe. Fixes: bf38bba3e7d6 ("drm/i915: Try to use the correct power sequencer intiially on bxt/glk") Cc: Ville Syrjälä <ville.syrj...@linux.intel.com> Signed-off-by: Jani Nikula <jani.nik...@intel.com> --- drivers/gpu/drm/i915/display/intel_bios.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index e6ca51232dcf..ad833069f59c 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -1033,6 +1033,7 @@ parse_lfp_backlight(struct drm_i915_private *i915, } panel->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI; + panel->vbt.backlight.controller = 0; if (i915->display.vbt.version >= 191) { size_t exp_size; -- 2.34.1